Diamond polishing disc supporting spindle



Feb. 18, 1947. ,J. c. BARTHO 2,416,141

DIAMOND POLISHING DISC SUPPORTING SPINDLE Filed Nov. 5, 1945 3% a l\ v u /7 mummn 6729 u I Patented Feb. 18, 1947 DIAMOND @GLISHING DISC SUPPOKTIN G SPIN DLE JohrnC. Bartho, Flushing, N. Y., .assignorol .one-

third to Jose .Da Silva and one-third Lto Anthony Rolenberg, both of N ew'York, N. Y.

ApplicationNovernber 3, 1943,: SerialrNO. 508,-789

( Cl. 3'0'8-I-168 2 Claims.

This invention relates generally to a diamond polishing machine.

In the diamond polishing machines with which applicant is familiar, the spindle for supporting the polishing disc is mounted in bearing members including ball or roller bearings and protected by gaskets to keep the oil from leaking. In such-machines, the spindle is generally approximatelyone inch to one one-quarter inches in diameter affording a small bearing surface or area and it is-subjected to considerable pressure or strain duetto the terrific pounding'on the polishing disc-adjacent its rim by the polishing tool held'inithe operators hand especially as such rim is generally more than live inches away from the spindleand bearings therefor, In such machines, such'pressure in time damages the bearing members and loosens the gaskets resulting in a wobbly and irregular motion of the spindle causing damage to thediamond being polished. The gaskets also become worn and loosen causing leakage of the oil.

'It is an object of my present invention to eliminate entirely the use of ball and roller bearings and the use of askets.

Another object is to'prevent-wobbly -andirregular'motion of the spindle.

A further object is to provide 'a spindle that will rotate uniformly. I

Still another object is to provide a-spin'd-le and bearing that is simple and rugged in-constru'c'tion and leak-proof.

A still further object is toprovide a tool for holding the'diamond in position againstthe rotating'disc that is simple in construction 1 and readily repaired.

These and other objects and advantages will be apparent from the description to follow taken in connection withthe accompanying drawing in which- I Fig. 1 is a top plan view of a diamond polishing machine embodying my invention mounted on a table, only a portion of the table being shown.

Fig. 2 is a sectional view across the center of the machine shown in Fig. 1.

Fig. 3 is a detail view partly in section showing the tool for holding the diamondinoperative position against the polishing disc.

My improved diamond polishing machine may be supported by a table or bench 5, the topsurface ofwhich is provided with an oil cloth or other suitable cover -6. 'Fastened to the underside of the table top by means of screws 1 or other fastening members is-aframe-S having afiatL-discp2 shaped horizontalpertion :9 and integral depending arms 10.

Formed integrally with the. horizontal disc portion 9is a cup-shaped bearing member and oil reservoir comprising an outer annular wall 11 and another annular wall orstep' l-Z spacedinwardly therefrom to form anoutercompartment 13 between said .walls, and a central upstanding sleeve member 14, the wall of which is spaced inwardly from-the intermediate wall 12 to-form an inner compartment I5. The top edge of the outer wall H is .slightly higher than the top edges of the intermediate wall it and theinner sleeve wall M. The intermediate wall l2 is tapered slightly inwardly from the top to the bottom-and fastened to. said tapered surface of the intermediate wall is a lining iii of babbitt'metal which forms .a tapered inner wearing lining for the intermediate wall. Spaced passages ll-are formed in the lower portion of the intermediate wall to provide communication between the inner compartment l5 and outer compartment l3.

.Fastened to the bottomof the depending arms l0 by-means of screws l8or other suitable means is a horizontal disc member l9 having a central depending flange or sleeve portion 2a and a central openingil. A cup-shaped bearing member of smaller diameter than the upper bearing member is formed integrally with the discmember l9 and comprises an outer-annular wall.22 andan inner sleeve member or step 23 spaced therefrom to form a compartment 24. ,The inner surface of the wall of sleeve member 23 is tapered inwardly from the top to the bottom, and the bottom of the wall is formed with spaced passages .25 to provide communication between the outer compartment 24 and the central compartment 26 in the sleeve member 23. A liningZl of babbitt metal is fastened to the-tapered inner surface of the sleeve member 23 to afford atapered wearing. surface. The outer wall 22 i higher than the sleeve wall 23.

My improved spindle comprises amain shaft 28 having a screw threaded portion at its .upper end. Fastened to the shaft in any suitable manner at a point remote from the top thereof is an inverted cup-shaped member having a horizontal disc shaped body portion 29 with. anupstanding. flange or collar .30 and provided with a central opening 3! therethrough. It is, formed with an outer annular. depending wall .32.and another wall' .33 spaced inwardly therefromto form a compartment 34 betweensaid walls. The inner wall 33 is massive and its outer surface is tapered inwardly from the top to the bottom. This :in-ner A disc or plate 38 for polishing a diamond 39 is removably mounted on the flange portion 39 and is held thereon by means of a nut 49 screw threaded on the top of the shaft 28. The disc. may have slots M for receiving a tool and the nut may also have slots 52 for a tool as will be understood.

When the parts are in operative position as shown in Fig. 2, the shaft 28 passes through the central opening 3i and the inverted cup-shaped member at the top of the shaft telescopes into the upper cup-shaped bearing member on the disc member 9, and it will be noted that the lower edge of the outer wall 32 extends below the top edge of the outer wall II of the cupshaped bearing member, and it will be further noted that the lower edge of the tapered inner wall 33 extends downwardly to a point above the floor of compartment I5 so as not to block the passages IT. The outer tapered surface of this wall 33 conforms to the inner tapered surface of the babbitt lining I3. It will also be noted that the tapered body of the sleeve 35 on the bottom of shaft 28 extends only to a point above the floor of the central compartment 26 so as not to block the passages 25, and that its outer tapered surface conforms to the inner tapered surface of the babbitt lining 21. A set screw 43 passes through the aligned opening 2I in the flange 29 and disc I9 and engages the bottom of shaft 28 so as to adjust the tension of thebearing parts and to keep the tapered walls 33 and 35 from binding onto the babbitt linings.

In use, a quantity of oil is placed inthe outer and inner compartments I3 and I5, respectively, of the upper cup-shaped bearing member and also in the outer and inner compartments 24 and 25, respectively, of the lower cup-shaped bear ing member. When the shaft 28 with its bearing members is rotated it of course carries the polishing disc 33 around with it for engagement the lining I6 and spilling it over the top edge of the intermediate wall I2 and into the outer compartmentI3. From the outer compartment I3 it is sucked through the passages I I in the bottom of wall I2 back into the inner compartment where it follows the same cycle over and over again while the shaft rotates. Inasmuch as the topedge of the outer wall I I is higher than the top edge of the intermediate wall I2 there is no chance of the oil spilling over said outer wall I I, and there is no chance of the oil spilling over the top edge of the sleeve wall I4 because of this pumping action. I

The oil in the lower. compartments 24 and is forced in the same manner by the tapered sleeve member from the inner compartment 23 ,up between the tapered surfaces of the sleeve and the lining 21 and over the top edge of wall 23 into the outer compartment 24 and from this outer compartment it is sucked through the passages 25 back into the inner compartment 26 where it follows the same cycle over and over again. The lower compartments may be prothis cupshaped bearing member is approximately four inches in diameter and the inner wall 33 thereof is about three inches across from edge to edge thereby affording a much greater bearing area which is adapted to coact with the'la'rge bearing area provided by the wall I2 of the cupshaped bearing member on the disc 9.

If the linings or the tapered surfaces of the walls should become worn and need adjustment, the tapered sleeve 35 on the bottom of the shaft may be removed and moved along the shaft totake up the slack and permit the necessary adjustment. Ordinary adjustment to prevent'binding is provided by the set screw 93 as stated above.

By reason of this improved construction, which is known as blind passage, no ball or roller bearings or gaskets are required. It keeps the shaft 28 and consequently the disc 39 perfectly centered at all times and assures smooth and regular rotation of the shaft and disc free from vibrations. Leakage of oil is prevented.

Another important feature of my invention is the improved construction of the tong or tool for carrying the diamond to' be polished and the mounting therefor.

I provide a slidable member comprisinga base plate 59 and a forward narrow neck portion 5|. An upstanding post 52 is mounted on the end of the neck portion 5| and a similar post 53 on the end of the plate 59. A slot 54 is formed in the center of the plate for receiving a bolt 55 extending up from the top of the support 6. The slidable member can slide on said support guiding by said bolt and can be secured in adjusted position by a nut 56 on the bolt.

A tong or tool 51 for carrying the diamond 39 comprises a body portion formed with two spaced legs 58 and formed so as to be grasped by the hand of the operator. A metal bar 59 is secured to the top of the body portion and is formed with a cutaway portion 69 at its outer free end and the surface of said free end opposite said cutaway portion is formed with a channel-shaped groove GI. A bolt 62 passing loosely through an opening in said outer free end mounts loosely a clamping plate 63 and a nut 64 secures a dop for supporting the diamond 39 between the plate and bar 59. A rod 65 extends outwardly from the body of the tool.

In using the tong or tool 51, it is placed on the base plate 59 supported by the legs 58 and so positioned that the forward free end of the bar 59 engages the post 52 on one side thereof and the rod 65 engages the post 53 on the opposite side thereof so that when moving back and forth over the base plate 59, such posts guide such movement. To adjust the angle of the tool relative to the polishing disc 35,'it is only necessary to loosen nut 56 and pivot the slidable member around the bolt 55.

From the foregoing it will be seen that I have provided a base plate and guide for the tool made of one piece whereas formerly the base plate was separate and secured to the table or other support and the slide was separate therefrom. It will also be seen that I have provided a tong or tool in which the bolt for supporting the clamping plate 63 is separate from the bar 59 and if it becomes damaged or needs to be repaired it can easily-be demounted from the bar and repaired or replaced. In the ordinary tongs, the bolt for mounting the clamping plate is formed integrally or immovably secured to the bar. The channeled shape groove BI is adapted to receive any shaped head of bolt 52.

I claim:

1. In a diamond polishing machine, a frame, an upper cup-shaped bearing member forme integrally with said frame and having an outer annular wall, an intermediate annular wall spaced inwardly from said outer wall to form an outer compartment therebetween and an upstanding sleeve member spaced inwardly from said intermediate wall to form an inner compartment between said intermediate wall and said sleeve member, said intermediate wall being provided with a tapered inner surface and with passages adjacent its bottom to provide communication between said outer and inner compartments and a tapered inner lining of babbitt metal secured to said tapered surface, a shaft member extending through said sleeve member for supporting a diamond polishing disk, said shaft carrying an inverted cup-shaped member adjacent its top end and having an outer annular depending wall and an inner depending wall spaced from said outer wall and projecting below the lowermost edge of said outer wall, said inner depending wall being formed with a tapered bearing surface to conform to the tapered surface of the lining of said intermediate wall for supporting the upper end of the shaft, a lower cup-shaped bearing member on said frame and having an outer annular wall and an inner sleeve member spaced inwardly from the outer Wall for supporting the upper end of the shaft to form a compartment therebetween, the inner surface of said sleeve being tapered and a tapered lining of babbitt metal secured to said inner tapered surface, said sleeve member and lining being provided with aligned passages, a tapered sleeve member removably and adjustably mounted on the lower end of said shaft to coact with said last-named tapered lining for supporting the lower end of the shaft and screw means directly engaging the lower end of the shaft member for adjusting the tension between the coacting tapered members.

2. In a diamond polishing machine, the combination with a rotatable spindle for supporting a diamond polishing disk and having tapered portions at its upper and lower ends, of apparatus for rotatably supporting and lubricating said spindle including a cup-shaped-bearing member for the upper end of the spindle having an outer annular wall, an intermediate annular Wall spaced inwardly from said outer wall forming an outer fluid compartment therebetween and an upstanding sleeve member spaced inwardly from said intermediate wall forming an inner fluid compartment between said intermediate wall and said sleeve member, said intermediate wall being provided with a tapered inner surface adapted to coact with the upper tapered portion of the spindle and with passages adjacent its bottom to provide communication between said outer and inner compartments, said outer annular wall being slightly higher than said intermediate Wall to prevent fluid from escaping from said outer compartment and a cup-shaped bearing member for the lower end of the spindle having an outer annular wall and an inner sleeve member spaced inwardly therefrom forming a fluid compartment therebetween, the inner surface of said sleeve being tapered to coact with the lower tapered portion of the spindle, said inner sleeve member being provided with a passage providing communication between said latter compartment and the interior of the sleeve member.

JOHN C. BARTI-IO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Bullard, Jr Aug. 21, 1906 

